Ravens S Ed Reed could be a coveted free agent, though he might get run down in this category by speedy Steelers WR Mike Wallace (17). / Gene J. Puskar, AP

by Nate Davis, USA TODAY Sports

by Nate Davis, USA TODAY Sports

With Super Bowl XLVII in the books, NFL teams will soon hit the aisles of the free agent supermarket, hoping to find the missing piece to a championship puzzle for 2013. Here's a look at some of the best players who could be available at each position:

Quarterback - Joe Flacco's contract has expired, but there's no way the Ravens are letting him leave Baltimore. A few quality backups will be out there - Jason Campbell, Tarvaris Jackson, Matt Moore - but teams looking for starting-caliber players will likely be making trade offers for Alex Smith and, maybe, Matt Flynn.

Running back - Reggie Bush is the prize. Over the last two seasons with the Miami Dolphins, he's proven he can be a lead back while answering questions about his durability, touching the ball 521 times (2,660 yards from scrimmage) but missing just one game. His work ethic and leadership would be welcome in any locker room. Elsewhere, Rashard Mendenhall is a great talent but brings injury and attitude concerns, whereas Shonn Greene is decidedly unspectacular but always available. With his contract recently terminated by the New York Giants, Ahmad Bradshaw is available immediately to any team that wants his services. Teams that value fullbacks might make a run at Pro Bowler Jerome Felton, who cleared the road for Adrian Peterson in 2012.

Wide receiver - Greg Jennings, who's both a great guy and great player, may draw the most interest. Injuries have hampered him the past two seasons, but he appeared to be back in top form by the time the playoffs rolled around this season. Teams valuing size can court Dwayne Bowe; those who covet deep speed will pursue Mike Wallace; slot stars Wes Welker and Danny Amendola could also be options.

Tight end - There is plenty of quality depth - and questions - here. Fred Davis may have the most talent, but he's also been hindered by drug and injury (torn Achilles) problems. Dustin Keller is a good downfield threat but missed half the 2012 season and isn't known for his blocking. Jared Cook has a ton of ability but also a bum shoulder and perhaps an attitude. Underrated Delanie Walker and Brandon Myers are in the bargain bin.

Offensive tackles - Ryan Clady might be the best left tackle in the league, which is why there's virtually zero chance he'll be leaving Denver. But Jake Long may not be staying in South Florida. Long is a four-time Pro Bowler, but his resume and ability may not quite align, especially given the arm injuries that have curtailed his past two seasons. Still, plenty of teams will probably line up to woo the top pick of the 2008 draft. Branden Albert, Sam Baker and Jermon Bushrod are all solid alternatives.

Guards/centers - Not much to be excited about here with the possible exception of Buffalo Bills guard Andy Levitre. Centers Dan Koppen, Todd McClure and Brad Meester are all near the end of the line.

Defensive ends - Cliff Avril, who says he can also play outside linebacker, should garner the most interest after registering 29 sacks over the past three seasons. However he could suffer from the cautionary tale of Ray Edwards, a decent pass rusher who cashed in after playing on a very good Minnesota Vikings defensive line before flaming out with the Atlanta Falcons. Dwight Freeney, who had middling success as a 3-4 outside linebacker in 2012, and Osi Umenyiora are nice options in the rental market. Cincinnati Bengal Michael Johnson (11½ sacks) is underrated, though probably not by his current team. Mike DeVito of the New York Jets is a very good run stopper. Finally, there's Glenn Dorsey, a highly valued defensive tackle when he came out of LSU in 2008, but a man who may have been playing out of position all this time with the Kansas City Chiefs.

Outside linebackers - Anthony Spencer (11 sacks) is coming off a career year and heads a group of solid young players, including Connor Barwin and Paul Kruger, who should be fine as 3-4 backers or 4-3 defensive ends.

Inside linebackers - Brian Urlacher, 34, has the biggest name but no longer the biggest upside. Dannell Ellerbe (who made some huge plays during the Baltimore Ravens' Super Bowl run), Rey Maualuga and DeAndre Levy (who can play inside or out) all have more shelf life at a position that seems to be diminishing in value in a league of spread offenses and option quarterbacks.

Cornerbacks - However here's a spot where clubs will likely be more willing to invest. Aqib Talib, Dominique Rodgers-Cromartie, Sean Smith, Brent Grimes, Mike Jenkins, Chris Houston, Derek Cox and Tracy Porter have a wide array of issues, but their talent is a common denominator.

Safeties - This group is even stronger than the corners, and likely Hall of Famer Ed Reed could be the headliner given the Ravens seem willing to let him test the free agency waters. Yet as good as Reed is and was, teams looking to solve this spot for the long term should make a run at young Pro Bowlers Jairus Byrd, Dashon Goldson or William Moore, players, like Reed, known for creating havoc and turnovers. Overflowing medical files may cost Louis Delmas, LaRon Landry and Kenny Phillips.

Special teams - Josh Cribbs is one of the best return men in NFL history and could also offer a role in offensive specialty packages. Kicker Phil Dawson and punter Dustin Colquitt received long overdue recognition as Pro Bowlers in 2012 and should be compensated accordingly. Lots of other excellent kickers (Mike Nugent, Lawrence Tynes among them) and punters (Shane Lechler, Donnie Jones) to choose from.